Internal reinforcement element for a tank made of plastic for a motor vehicle

An internal reinforcing element for a plastic tank for a motor vehicle, made from a single piece and comprising:

• a central portion which in cross-section has the shape of an annulus sector, defining a main axis of the reinforcing element and having a first surface area, the main axis passing through the center of rotation of the annulus sector perpendicular to the annulus sector, the central portion comprising a network of ribs extending radially in relation to the main axis, referred to as a network of radial ribs, and
• two axial end portions which are situated one on each side of the central portion when considering the main axis, each of the axial end portions having an end surface of curved and oblong shape inscribed inside the cross section of the central portion and having a second surface area smaller than the first surface area,
• wherein a cross-section of the internal reinforcing element along a plane parallel to the main axis of the radial rib tapers from the central portion to the axial end portions.